Volume 19, Number 9—September 2013
Research
New Estimates of Incidence of Encephalitis in England
Table 1
Definition of numerator for encephalitis incidence estimates, England
| First-ever episode* | Subsequent episodes |
|---|---|
| Encephalitis code in any diagnostic field (1–20) |
Subsequent encephalitis code/s represented a different etiology to that recorded for the first-ever episode; for identical codes, both were in the primary diagnostic field and the end date of the first episode and start date of the subsequent spell were >6 mo apart |
| Encephalitis code in primary diagnostic field only | Subsequent encephalitis codes were also in the primary diagnostic field and represented a different etiology to that recorded for the first-ever episode; for identical codes, both were in the primary diagnostic field and the end date of the first spell and start date of the subsequent spell were >6 mo apart |
*Refers to the first-ever episode within this dataset.
1On behalf of the United Kingdom Public Health England Aetiology of Encephalitis Study Group (members listed at the end of this article).
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